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Influence of Solution Volume on the Dissolution Rate of Silicon Dioxide in Hydrofluoric Acid

14-11-2014 | Boris Shvartsev, Danny Gelman, Ilia Komissarov, Alon Epshtein, David Starosvetsky, Yair Ein‐Eli, ChemPhysChem, 2014

Abstract Experimental data and modeling of the dissolution of various Si/SiO2 thermal coatings in different volumes of hydrofluoric acid (HF) are reported. The rates of SiO2‐film dissolution, measured by means of various electrochemical techniques, and alteration in HF activity depend on the ...


Molecules, Vol. 19, Pages 18705-18720: Removing Tannins from Medicinal Plant Extracts Using an Alkaline Ethanol Precipitation Process: A Case Study of Danshen Injection

14-11-2014 | Gong, Xingchu ; Li, Yao ; Qu, Haibin, Molecules, 2014

The alkaline ethanol precipitation process is investigated as an example of a technique for the removal of tannins extracted from Salviae miltiorrhizae Radix et Rhizoma for the manufacture of Danshen injection. More than 90% of the tannins can be removed. However, the recoveries of danshensu, ...


Bending Nanofibers into Nanospirals: Coordination Chemistry as a Tool for Shaping Hydrophobic Assemblies

13-11-2014 | Elizaveta Kossoy, Haim Weissman, Boris Rybtchinski, Chemistry - A European Journal, 2014

Abstract In the current work, we demonstrate how coordination chemistry can be employed to direct self‐assembly based on strong hydrophobic interactions. To investigate the influence of coordination sphere geometry on aqueous self‐assembly, we synthesized complexes of the amphiphilic perylene ...


Solution Synthesis of Metal Silicide Nanoparticles

12-11-2014 | Joshua M. McEnaney; Raymond E. Schaak, Inorganic Chemistry, 2014

Transition-metal silicides are part of an important family of intermetallic compounds, but the high-temperature reactions that are generally required to synthesize them preclude the formation of colloidal nanoparticles. Here, we show that palladium, copper, and nickel nanoparticles react with ...


Core-Liquid-Induced Transition from Coaxial Electrospray to Electrospinning of Low-Viscosity Poly(lactide-co-glycolide) Sheath Solution

12-11-2014 | C. J. Luo; M. Edirisinghe, Macromolecules, 2014

Co-electrospinning has demonstrated that polymer solutions below the entanglement concentration can be made into fibers as an encapsulated core in an electrospinnable sheath solution containing a carrier/template polymer. The carrier polymer may require removal at a later stage. This work shows ...


Arsenic Mobility during Flooding of Contaminated Soil: The Effect of Microbial Sulfate Reduction

12-11-2014 | Edward D. Burton; Scott G. Johnston; Benjamin D. Kocar, Environmental Science & Technology, 2014

In floodplain soils, As may be released during flooding-induced soil anoxia, with the degree of mobilization being affected by microbial redox processes such as the reduction of As(V), Fe(III), and SO42–. Microbial SO42– reduction may affect both Fe and As cycling, but the processes involved and ...


Fast Kinetics of Thiolic Self-Assembled Monolayer Adsorption on Gold: Modeling and Confirmation by Protein Binding

12-11-2014 | Sasan Asiaei; Patricia Nieva; Mathilakath M. Vijayan, Journal of Physical Chemistry B, 2014

This study presents an improved kinetics for the formation of self-assembled monolayers (SAMs) of thiols on gold substrates. Based on predictions of a computational model developed to study the SAM growth kinetics, SAMs of 11-mercaptoinic acid and 1-octanethiol were successfully formed for the ...


Density Functional Theory Study of the Oligomerization of Carboxylic Acids

12-11-2014 | Devis Di Tommaso; Ken L. Watson, Journal of Physical Chemistry A, 2014

We present a density functional theory [M06-2X/6-31+G(d,p)] study of the structures and free energies of formation of oligomers of four carboxylic acids (formic acid, acetic acid, tetrolic acid, and benzoic acid) in water, chloroform, and carbon tetrachloride. Solvation effects were treated using ...


Solution Photochemistry of [p-(Dimethylamino)phenyl]pentazole (DMAPP) at 193 and 300 nm

11-11-2014 | B. Bazanov; Y. Haas, Journal of Physical Chemistry A, 2014

The photochemistry of [p-(dimethylamino)phenyl]pentazole (DMAPP) at 193 nm and in the near UV is reported, with emphasis on the nature of the final stable products. The (dimethylamino)phenyl azide (DMAPA) is found as a major product in MeCN, but not in dichloromethane (DCM). (In this paper the ...


Effect of Salts on Formation and Stability of Vitamin E-Enriched Mini-emulsions Produced by Spontaneous Emulsification

11-11-2014 | Amir Hossein Saberi; Yuan Fang; David Julian McClements, Journal of Agricultural and Food Chemistry, 2014

Emulsion-based delivery systems are being utilized to incorporate lipophilic bioactive components into various food, personal care, and pharmaceutical products. This study examined the influence of inorganic salts (NaCl and CaCl2) on the formation, stability, and properties of vitamin E-enriched ...


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